FN Archimer Export Format
PT J
TI Effect of yolk utilization on the specific gravity of chokka squid (Loligo reynaudii) paralarvae: implications for dispersal on the Agulhas Bank, South Africa
BT 
AF MARTINS, Rodrigo S.
   ROBERTS, Michael J.
   CHANG, Nicolette
   VERLEY, Philippe
   MOLONEY, Coleen L.
   VIDAL, Erica A. G.
AS 1:1,2,3;2:1;3:4;4:5,6;5:2,3;6:7;
FF 1:;2:;3:;4:;5:;6:;
C1 MCM, ZA-8012 Cape Town, South Africa.
   Univ Cape Town, Dept Zool, ZA-7701 Rondebosch, South Africa.
   Univ Cape Town, Marine Res Inst, ZA-7701 Rondebosch, South Africa.
   Univ Cape Town, Dept Oceanog, ZA-7701 Rondebosch, South Africa.
   Ctr Bretagne, UR ECO UP, IRD, F-29280 Plouzane, France.
   IFREMER UBO, CNRS, UMR 6523, LPO, F-29238 Brest 3, France.
   UFPR, CEM, BR-83255000 Pontal Do Parana, PR, Brazil.
C2 MCM, SOUTH AFRICA
   UNIV CAPE TOWN, SOUTH AFRICA
   UNIV CAPE TOWN, SOUTH AFRICA
   UNIV CAPE TOWN, SOUTH AFRICA
   IRD, FRANCE
   UBO, FRANCE
   UFPR, BRAZIL
IF 1.808
TC 12
UR https://archimer.ifremer.fr/doc/00013/12461/9316.pdf
LA English
DT Article
DE ;Agulhas Bank;chokka squid;dispersal;paralarvae;specific gravity
AB Specific gravity is an important parameter in the dispersal of marine zooplankton, because the velocity of currents, and therefore the speed of transport, is usually greatest near the surface. For the South African chokka squid (Loligo reynaudii), recruitment is thought to be influenced by the successful transport of paralarvae from the spawning grounds to a food-rich feature known as the cold ridge some 100-200 km away. The role of paralarval specific gravity on such transport is investigated. Specific gravity ranged from 1.0373 to 1.0734 g cm(-3) during the yolk-utilization phase, implying that paralarvae are always negatively buoyant, regardless of yolk content. The data were incorporated into a coupled individual-based model (IBM)-Regional Ocean Modelling System model. The output showed that dispersal was dominantly westward towards the cold ridge. Also, modelled paralarval vertical distribution suggested that hydrodynamic turbulence was an important factor in dispersal. The negative buoyancy of early chokka squid paralarvae may reduce the risk of paralarvae being advected off the eastern Agulhas Bank and into the open ocean, where food is less abundant, so specific gravity may be important in enhancing the survival and recruitment of chokka squid.
PY 2010
PD OCT
SO Ices Journal Of Marine Science
SN 1054-3139
PU Oxford Univ Press
VL 67
IS 7
UT 000281719300003
BP 1323
EP 1335
DI 10.1093/icesjms/fsq098
ID 12461
ER

EF